Binocular.



Ilowing is a specification.

proposed whlch employed a worm gear hav-V c UNITED sTATEs PATENT oEEIoE.Q

KARL MARTIN AND GEORG sr'IEeE, or nA'rnENom-GE'nMANY, AssIeNons To THE-conrANY EMIL Busen, AcrInNensnLLscHArr, orrrscnn INDUSTRIE, or RATHE- fNOW, GERMANY.

Specilloation of Letten Patent. Application mea mmf-y 11, 1909. serialNo. 471,82'8. f-

BI/NOCULAR.

To all whom 'it may concern: v

Be it known that we, KARL MARTIN and GEORG STIEGE, subjects of the Kingof Prussia,- German Emperor, and i residents of Rathenow, in the GermanEmpire, have invented certain new and-useful Improvements Relating toBinoculars, of which the-fol- This invention relates to which theeye-piece is formed of two lenses adapted to be adjusted so as to securevariable magnilication within certain limits.

With binoculars of this kind in order to obtain good definition it isnecessary thatlthe eye-piece receive a two-fold motion; one motion forthe purpose of adjusting the eyepiece lenses to obtain the desiredmagnification and then a second motion of the entire eye-piece withreference to thel objective in order to secure the original cleardelinition.,

For this purpose devices have already been ing a changing pitch ofscrew, but such devices are diiicult to manufacture and unsatisfactory.

. The object of the present invention is to provide simple and elfectivemeans for obtaining the necessary non-uniformity in the motions, that isto say, the two-fold motion described above. For this purpose the lensesof the eye-pieceare adjusted from a rotatable member co-acting withscrews and this rotatable member is itself axially moved during rotationby means of a correction cam. The axial motion of the rotatable memberis of course small and by making the cam of a comparatively largediameter this correction motion may be obtained with much greateraccuracy than was possible in former constructions. j f

The accompanying drawing isa longitudinal section through Athe operatingear for effecting the adjustment of binocu ars according to the presentinvention. The bodies 2 of the binocular are carried by thebridge-pieces aland a2 while the separate lenses 3 and 4 of theeye-piece are carried by ,the bridge-pieces b andl b2. The bridgepiece bhas fixed to it an internally threaded tube al while the bridge-'pieceb2 has fixed to it a solid spindle e. The threads on the solid spindle eand the hollow tube d are oppositely handed. 'With both the screwthreads described there simultaneously engages a threaded member c whichis rotated binoculars in by means of amilled wheel lc. The milled wheelc 1s fixed b cementing or thelike to a sleeve surroun ing the hollowthreaded member `@land a pin a fixed in the rotatable screw c engageswith itshead in a slot on this sleeve. The slot in which the pin sengages is elongated so as to permit axial motion of the rotatablemember c. In this way it will be seen that the rotatable member` c iscaused to l.follow the rotary motion of the milled wheel *la but at thesame time may be moved axially. I When moved axially the rotatablemember c carries with it both the vhollowthreaded memberd and the solidY b and b2'. This axial movement or the ro` tatable member c is s ecuredby means of a Patented oct. 26,1909

cam c formed on the end of the rotatable j member c and provided with ascrew formed orspiral Agroove t in which there engages vthe point of apin t. lThe pin tv is fixed to a cap t2 attached to a frame a2. Withthis construction the cam groove t effects the necessary correction inthe `position of the eye-piece with reference to the objective for thepurpose of obtaining clear definition. We claim:

`- l. A" binocular Vhaving' in combination with the objective lenses andeye-pieces,

-each of said eye-pieces having two relatively adjustable lenses,threaded members coupled to the corresponding vlenses of each of theeye-pieces, a member simultaneously engaging said threaded members toeect adjustment of said lenses, and means for moving said engagingmember bodily simultaneously with the eye-piece lenses and in the amountand direction to effect the necessary correction for clear definition.

l `2. Abinocular 4having in combination objective lenses, a lframesupporting said lenses, eye-pieces having each two relatively adjustablelenses, bridge-pieces carrying said, eye-piece lenses, threaded membersconnected to said bridge-pieces, a rotatable member simultaneouslyengaging said threaded members, said rotatable member being slidablealong its axis of rotation and cam vmeans for moving said rotatablemember axially during its rotation.

3'. A binocular having in combination with the frame tubes, objectivelenses mounted in said tubes, eyeiecescomposed each of two lensesadjustab y mounted relatively to one another, two bridge-pieces by whichvsaid. lenses are slipported a solid the frame of the binocular andengaging 1.'. threaded member fixed to one of said bridgewith its pointin said cam groove.

peees,. and a hollow threaded member fixed dIn witness whereof we havehereunto set to the other, an internally and externally our hands in thepresence lof two witnesses.

. L threaded member enga ing simultaneously KARL MARTIN.

` with said solid and ho ow threaded mem- GEORG STIEGE.`

bers and axially slidable; a cam having an Witnesses: inclined spiralgroove therein formed with HENRY HAsPER, said rotatable member and a pincarried by WOLDEMAR HAUPT. g

